Toshiba e-studio281c, Service Manual, Page: 43 / 414

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OUTLINE OF THE MACHINE
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2.4.2 Construction of boards
[ 1 ] Construction diagram of boards
This system consists of the following including the SYS board as a main board.
Fig. 2-20
[ 2 ] Function of each board
• CCD board:
This is the board to convert the reflected light by the original to electrical signals. It consists of the
CCD, A/D converter, etc. The CCD converts the reflected light by the original to three-color analog
signal; red, green, blue, and the A/D converter converts each analog signal to digital.
• SLG board:
This is the board to mainly control the scanning function (scanner unit) and consists of the Scanner-
CPU, ASIC, memory (Flash ROM, SRAM), etc. When scanning the original, the exposure lamp and
scan motor are started by the command from the Scanner-CPU. And the image processing is per-
formed for the image data sent from the CCD by each ASIC.
• INV board:
This is the board on which the lighting control circuit of the exposure lamp is mounted. The exposure
lamp lights by the command from the Scanner-CPU.
• DSP board:
This is the board to mainly control the control panel. The Panel processing CPU detecting the input
from each button and touch panel, and the lighting control circuit for the backlight of the LCD are
mounted. And it relays the control signal of the control panel from the SYS board to the LCD and
KEY board.
• KEY board:
This is the board on which each button switch and each LED on the control panel are mounted.
: DC power supply line
: AC power supply line
: Signal line
AC input
Main switch
Cover opening/closing
interlock switch
SYS
PS-ACC FIL
LGC
CCD
INV
SLG
Scanner unit
KEY DSP
Control panel
ADU
SFB
HVT
DRV
IH
LDR SNS
Laser unit